Perhaps you should try some spelling variations:
"nguyen chi minh khai" » "nguyen thi minh khai", "nguyen can minh khai", "nguyen hai minh khai", "nguyen chi minh khue", "nguyen chi minh chau", "nguyen chi minh thao"
"nguyen nhu minh pham" » "nguyen thi minh pham", "nguyen huu minh pham", "nguyen huy minh pham", "nguyen nhu minh chau", "nguyen nhu dinh phap", "nguyen nhu minh thao", "nguyen nhu binh pham", "nguyen phu minh pham", "nguyen nhat minh pham"
"nguyen thu minh chi" » "nguyen thi minh chi", "nguyen tu minh chi", "nguyen huu minh chi", "nguyen vu minh chi", "nguyen thu dinh chi", "nguyen thu linh chi", "nguyen thu minh chau"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("nguyen chi minh khai") or ((("nguyen nhu minh pham") or ("nguyen thu minh chi"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nguyen chi minh khai") OR ((("nguyen nhu minh pham") OR ("nguyen thu minh chi")))).
• Removing quotes may allow a broader search: (( nguyen chi minh khai ) or ((( nguyen nhu minh pham ) or ( nguyen thu minh chi )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen chi minh khai") or ((("nguyen nhu minh pham") or ("nguyen thu minh chi"))))*.